Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Schedule of Equity Compensation Plan by Arrangements (Details)

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Stock Based Compensation - Schedule of Equity Compensation Plan by Arrangements (Details) - 2013 Equity Compensation Plan [Member]
shares in Thousands
6 Months Ended
Jun. 30, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Reserved for Issuance 17,890
Awards Issued 13,603 [1]
Awards Available for Grant 4,287
[1] includes both stock grants and option grants